Question:
Is it a problem if a fleishig soup spills over on to the stove top, and before it’s cleaned a milchig food is cooked on that stove top, on the same fire?
Answer:
If there is actual meaty food on the stovetop, it should be cleaned off before using for milky food. After the fact the food will remain kosher, as we assume the small amount on the actual grates is burnt up by the flame.
Sources:
Igros Moshe Y:D 1:59, Halichos Shlomo, Pesach chapter 3, footnote 9.
